TY  - JOUR
A1  - Tremel, Kim
A1  - Fischer, Florian S. U.
A1  - Kayunkid, Navaphun
A1  - Di Pietro, Riccardo
A1  - Tkachov, Roman
A1  - Kiriy, Anton
A1  - Neher, Dieter
A1  - Ludwigs, Sabine
A1  - Brinkmann, Martin
T1  - Charge transport anisotropy in highly oriented thin films of the acceptor polymer P(NDI2OD-T2)
T2  - dvanced energy materials
N2  - The nanomorphology of the high mobility polymer poly{[N,N'-bis(2-octyldodecyl)-1,4,5,8-naphthalenedicarboximide-2,6-diyl]-alt-5,5'-(2,2'-bithiophene)} P(NDI2OD-T2) in thin films is explored as a function of different annealing conditions and correlated to optical and electrical properties. While nanofibrils with face-on orientation in form I are obtained directly after spin-coating and annealing below the melt transition temperature, clear evidence of lamellar structures is found after melt-annealing followed by slow cooling to room temperature. Interestingly these structural changes are accompanied by distinct changes in the absorption patterns. Electron diffraction measurements further show clear transitions towards predominant edge-on oriented chains in form II upon melt-annealing. Large-scale alignment with dichroic ratios up to 10 and improved order is achieved by high temperature rubbing and subsequent post-rubbing annealing. These highly oriented morphologies allow anisotropic in-plane charge transport to be probed with top-gate transistors parallel and perpendicular to the polymer chain direction. Mobilities up to 0.1 cm(2) V-1 s(-1) are observed parallel to the polymer chain, which is up to 10 times higher than those perpendicular to the polymer chain.
Y1  - 2014
UR  - https://publishup.uni-potsdam.de/frontdoor/index/index/docId/37711
SN  - 1614-6832
SN  - 1614-6840
VL  - 4
IS  - 10
PB  - Wiley-VCH
CY  - Weinheim
ER  -